Sanding fiberglass before epoxy.

5

540goat

What grit paper should I sand my corvette with before applying epoxy. I know it says metal and aluminum 80 grit. Is that the same with fiberglass.
 
I've done both 80 and 180 on raw vetes, can't say i can tell a difference.
If gun to my head and had to break down, I'd guess 70% have been 80 grit.
 
Just shot some fiberglass sprint car parts, sanded with 180 after repairs, stress cracked all to heck, with SPI epoxy. Best product I have ever used for this application by far. Sprayed 3 coats, 30 minutes between coats, with a 1.3 tekna and all the cracks disappeared. Sanded next day with 320 and are ready to seal and paint.
 
That is the thing I'm worried about on the 53 I'M doing. How to best address the stress cracked areas? Car has a fair amount of spider web cracks in the gel coat.
 
Some the epoxy will stop and some it won't. All stress cracks will go through 2k base and clear so a flexible epoxy can work.
Can you post a picture of bad area and a normal area.
 
if it is what use to be called cold shatter the only sure fix is to sand it well and gelcoat it . epoxy will fix just about everything but bad spider webbing is just asking too much . i dont use gelcoat much anymore but on a really bad one i will go to gelcoat in a heartbeat.
 
The gelcoat on the sprint car parts is very thin unlike a corvette. I'm with shine, and a lot of times the cracks in the vettes go down into the glass. I would never trust epoxy alone to repair something like an old vette. What about a coat of vpa over the bad areas before or after epoxy? Would that work?
 
I'm in Dallas this week so don't have any pictures right now. I was leaning towards sanding the body real good to clean up everything then gelcoat it.I also have a roll of veil cloth to use with my epoxy resin over some of the areas that need repair with mat. I was also thinking I could cover the entire body with the cloth then do final body work.
 
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